CN219017867U - Electrode assembly and cylindrical battery - Google Patents

Electrode assembly and cylindrical battery Download PDF

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Publication number
CN219017867U
CN219017867U CN202223216327.1U CN202223216327U CN219017867U CN 219017867 U CN219017867 U CN 219017867U CN 202223216327 U CN202223216327 U CN 202223216327U CN 219017867 U CN219017867 U CN 219017867U
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electrode
electrode assembly
axial direction
battery
tab
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CN202223216327.1U
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Chinese (zh)
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林惠珍
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LG Energy Solution Ltd
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LG Energy Solution Ltd
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H01M10/0431—Cells with wound or folded electrodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H01M10/0422—Cells or battery with cylindrical casing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/24—Alkaline accumulators
    • H01M10/28—Construction or manufacture
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/24—Alkaline accumulators
    • H01M10/30—Nickel accumulators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings, jackets or wrappings of a single cell or a single battery
    • H01M50/102—Primary casings, jackets or wrappings of a single cell or a single battery characterised by their shape or physical structure
    • H01M50/107—Primary casings, jackets or wrappings of a single cell or a single battery characterised by their shape or physical structure having curved cross-section, e.g. round or elliptic
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings, jackets or wrappings of a single cell or a single battery
    • H01M50/147—Lids or covers
    • H01M50/148—Lids or covers characterised by their shape
    • H01M50/152—Lids or covers characterised by their shape for cells having curved cross-section, e.g. round or elliptic
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
    • H01M50/46—Separators, membranes or diaphragms characterised by their combination with electrodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/533—Electrode connections inside a battery casing characterised by the shape of the leads or tabs
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/538—Connection of several leads or tabs of wound or folded electrode stacks
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/543—Terminals
    • H01M50/545—Terminals formed by the casing of the cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/572—Means for preventing undesired use or discharge
    • H01M50/584—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries
    • H01M50/586—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries inside the batteries, e.g. incorrect connections of electrodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/572—Means for preventing undesired use or discharge
    • H01M50/584—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries
    • H01M50/59—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries characterised by the protection means
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/572—Means for preventing undesired use or discharge
    • H01M50/584—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries
    • H01M50/59—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries characterised by the protection means
    • H01M50/593—Spacers; Insulating plates
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2220/00—Batteries for particular applications
    • H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Abstract

An electrode assembly, a cylindrical battery. A first electrode tab (23) is formed to protrude from one side of the electrode assembly (1) in the axial direction, and a second electrode uncoated portion (41) is exposed from the other side of the electrode assembly in the axial direction. The electrode assembly (1) is accommodated in a battery can (6), the first electrode tab (23) is electrically connected to a lid (63) of the battery can (6), and the second electrode uncoated portion (41) is electrically connected to the battery can (6). At this time, the length of the first electrode (2) in the axial direction is shorter than the length of the second electrode (4), and the distance between the first electrode (2) and one end portion of the second electrode (4) in the axial direction is smaller than the distance between the other end portion of the first electrode (2) in the axial direction and the beginning of the uncoated portion (21, 41) on the second electrode (4). The first electrode tab (23) is insulated from only a portion where interference with the second electrode (4) is likely to occur.

Description

Electrode assembly and cylindrical battery
Technical Field
The present utility model relates to an electrode assembly, and a cylindrical battery including the electrode assembly in a jelly-roll form. Specifically, the anode and the cathode are respectively divided into an electrode assembly and a cylindrical battery structure of a tab structure and an electrodeless tab structure.
Background
In addition to portable devices, secondary batteries, which are highly convenient to apply based on product groups and have electrical characteristics such as high energy density, are widely used in Electric Vehicles (EV) or hybrid Electric vehicles (HEV, hybrid Electric Vehicle) driven by an Electric driving source, and the like.
Such secondary batteries have the primary advantage of being able to greatly reduce the use of fossil fuels, and the advantage of not generating by-products at all with the use of energy, and thus have been attracting attention as new energy sources for environmental protection and energy efficiency improvement.
The types of secondary batteries that are widely used at present are lithium ion batteries, lithium polymer batteries, nickel cadmium batteries, nickel hydrogen batteries, nickel zinc batteries, and the like. The operating voltage of such a unit secondary battery cell, that is, the unit battery cell, is about 2.5V to 4.5V. Therefore, if a higher power voltage is required, a plurality of battery cells are sometimes connected in series to constitute a battery pack. Depending on the charge/discharge capacity required for the battery pack, a plurality of battery cells may be connected in parallel to form the battery pack. Therefore, the number of battery cells and the electrical connection method included in the battery pack can be designed in various ways according to the required power voltage and/or charge/discharge capacity.
On the other hand, as the type of unit secondary battery cells, cylindrical, square and pouch battery cells are disclosed. The cylindrical battery cell is configured by sandwiching a separator film as an insulator between an anode and a cathode, winding up the separator film to form a jelly-roll-shaped electrode assembly, and inserting the jelly-roll-shaped electrode assembly into a battery can. The uncoated portions of the anode and the cathode may be connected to a strip-shaped electrode tab, and the electrode tab electrically connects the electrode assembly to an electrode terminal exposed to the outside. For reference, the anode electrode terminal is a cap plate of a sealing member sealing an opening of the battery can, and the cathode electrode terminal is the battery can. However, according to the conventional cylindrical battery cell having such a structure, current is concentrated in the strip-shaped electrode tab coupled to the uncoated portion of the anode and/or the uncoated portion of the cathode, and thus there are problems in that the resistance is large, heat generation is large, and the current collection efficiency is not high.
Resistance and heat generation do not constitute a major problem in small cylindrical cells having a form factor of 18650. However, in the case of a large-capacity cylindrical battery cell, when the internal resistance is large, there is a problem in that the cylindrical battery cell fires due to a large amount of heat generated around the electrode tab during rapid charge.
In order to solve such a problem, various methods have been attempted. Typically, there are a method of increasing the number of electrode tabs to a plurality of electrode tabs to increase the current path, and a method of arranging electrode tabs on the middle side of the electrode with reference to the electrode before winding to shorten the current path. The resistance has a property of being inversely proportional to the area of the path through which the current flows and proportional to the length thereof, and thus the resistance can be reduced by such a method.
Fig. 3 is a cross-sectional view of a cylindrical battery including an electrode assembly in a jelly-roll form having a tab structure. Of the anode 2 and the cathode 4, the current is connected to the battery can lid 63 or the battery can 6 only through the anode tab 23 or the cathode tab 43 formed at 1 or 2 or more of the respective anode 2 and cathode 4. In this case, the area of the current path is small, and the resistance increases.
Fig. 1, 2a and 2b show the state before winding of the anode and the cathode of the electrode assembly having the tab structure and forming the gel roll form. Referring to these drawings, the anode 2 is shorter in length than the cathode 4, and 2 anode tabs 23 are located in the middle of the anode 2. In contrast, the cathode 4 is wound radially outward and longer than the anode 2, and the cathode tab 43 can be located only at both ends in the manufacturing process. Thus, the anode 2 greatly reduces the resistance by a method of reducing the length of the current path, but particularly in the case of the cathode 4, other methods of reducing the resistance are urgently required.
Other methods that have been conceived for reducing the resistance are gel roll batteries that do not utilize the electrode tab structure. Fig. 4 is a sectional view of a cylindrical battery including an electrode assembly in a jelly-roll form having an electrodeless ear structure. Referring to the figure, an anode uncoated portion 21 of an uncoated active material is formed to protrude from one side of the anode 2 in the axial direction, and a cathode uncoated portion 41 of an uncoated active material is formed to protrude from the other side of the cathode 4 in the axial direction. Each of the uncoated portions 21, 41 is welded to the collector plate 5 so that the entirety thereof functions as an electrode tab. This increases the area of the current path, and can significantly reduce the resistance. At this time, the uncoated portions 21 and 41 are bent in the radial direction to form flat surfaces so as to improve the welding characteristics with the current collector plate 5.
However, such an electrodeless ear structure as described above has a high possibility of occurrence of a short circuit between the cathode and the anode in the process of welding the uncoated portions 21, 41 to the collector plate 5 or in the process of bending the uncoated portions 21, 41 in order to improve welding characteristics. In addition, the tab-less structure also requires an insulating layer 65 for insulating between the anode collector plate and the battery can, and further requires a length in the axial direction of the battery can to an extent corresponding to the thickness of the anode uncoated portion 21 and the collector plate 5, so that the battery capacity can only be reduced.
On the other hand, in the electrode assembly in the jelly-roll form, the thickness of the portion to which the tab is connected is thicker than the portion to which the tab is not connected. Thus, the radius of the jelly-roll at the portion where the tab is located in the circumferential direction in the electrode assembly wound in the jelly-roll form is larger than the radius of the jelly-roll at the portion where the tab is not present. Due to such a difference in radius, the portion where the tab is located receives a larger pressure in the radial direction than the portion where the tab is not present during the repetition of charging and discharging of the cell, and thus degradation such as chipping of the hollow portion of the winding core or detachment of the attached layer occurs more rapidly.
Disclosure of Invention
Problems to be solved by the utility model
The present utility model has been made in view of the above-described background of the conventional art, and an object of the present utility model is to provide an electrode assembly in a jelly-roll form capable of reducing the resistance of a second electrode, which is limited in terms of reduction of resistance, when only the tab structure of two electrodes is improved, and a structure of a cylindrical battery including the electrode assembly.
Further, an object of the present utility model is to provide an economical electrode assembly and a structure of a cylindrical battery including the same, which can simplify the structure and manufacturing process as much as possible, thereby improving space flexibility and increasing capacity.
Another technical object of the present utility model is to provide an electrode assembly capable of minimizing the possibility of occurrence of a short circuit between a first electrode and a second electrode without applying an excessive insulation process, and a structure of a cylindrical battery including the same.
Further, an object of the present utility model is to provide an electrode assembly and a cylindrical battery structure including the same that minimize a phenomenon of degradation of a unit due to the thickness of a tab when one or more tabs are used in order to reduce resistance.
Further, it is an object of the present utility model to provide a battery pack including the above improved cylindrical battery cell and an automobile including the above battery pack.
The technical problems of the present utility model are not limited to the above-mentioned objects, and other objects and advantages of the present utility model not mentioned herein will be more clearly understood from the following description and examples of the present utility model. Furthermore, the objects and advantages of the utility model may be realized by means of the instrumentalities and combinations particularly pointed out in the appended claims.
Means for solving the problems
In order to solve the above-described problems, the present utility model provides an electrode assembly in a jelly-roll form, which is configured by winding an electrode laminate including a first electrode, a second electrode, and a separator film, wherein the first electrode is provided with a first electrode uncoated portion to which an active material is not applied, a first electrode tab electrically connected to the first electrode uncoated portion protrudes on one side in the axial direction of the electrode assembly, and a second electrode uncoated portion to which an active material is not applied is provided on the other side end in the axial direction of the second electrode, thereby functioning as a tab.
The first electrode uncoated portion is provided in a region corresponding to a region where the active material is not coated in the axial direction.
The first electrode uncoated portion is formed to extend further outward in the axial direction from an end portion in the axial direction of the region coated with the active material.
The first electrode uncoated portion is provided in the overall length direction or a part of the length direction.
The first electrode uncoated portion is formed in one or more first electrode tabs.
The two or more first electrode tabs are stacked and electrically connected to form one tab.
The one first electrode tab is connected to the first electrode at a position avoiding both end portions of the first electrode in the winding direction.
The two or more first electrode tabs are connected to the first electrode at positions avoiding both end portions and a central portion of the first electrode in the winding direction.
In the case where only one of the first electrode tabs is provided, in order to prevent an increase in resistance due to an increase in current path, when the first electrode is divided in the width direction so as to be 3-equally divided in the winding direction, the first electrode is electrically connected to the first electrode at a position avoiding two regions at both ends in the winding direction.
When the first electrode is divided in the width direction so as to be equally divided by 4 in the winding direction in order to prevent an increase in resistance due to an increase in current path, one first electrode tab is provided in each of the two regions in the middle 2 regions avoiding both ends in the winding direction, and is electrically connected to the first electrode. In the case of providing 3 or more first electrode tabs, the current path is reduced by arranging the first electrode tabs in a similar manner.
According to the method for disposing the first electrode tabs, the plurality of first electrode tabs are disposed at different radial positions from each other in the radial direction.
The plurality of first electrode tabs are disposed so as not to overlap with each other in positions in the circumferential direction in the electrode assembly in which the plurality of first electrode tabs are connected to a region corresponding to the region where the active material is applied in the axial direction.
The positions in the circumferential direction at which the plurality of first electrode tabs are arranged overlap each other in the electrode assembly in which the plurality of first electrode tabs are connected to a first electrode uncoated portion that extends further outward in the axial direction than the end in the axial direction of the region where the active material is applied.
The first electrode tab is connected to the first electrode at an appropriate position so as to be easily connected to each other in a state where the electrode laminate is wound.
The second electrode uncoated portion may be formed continuously in the winding direction at the other end portion of the second electrode in the axial direction, or may be formed intermittently in the winding direction.
The height of the second electrode uncoated portion protruding in the axial direction increases continuously or intermittently.
The second electrode uncoated portion is bent in the radial direction in order to improve the welding performance with the collector plate or the bottom surface of the battery can, which will be described later.
A collector plate is bonded to the uncoated portion of the second electrode. For example, the current collecting plate is bonded to the surface of the second electrode uncoated portion bent in the above-described radial direction by welding.
The second electrode and the separation film have a length longer than that of the first electrode in the axial direction.
One end of the first electrode in the axial direction is lower than one end of the second electrode in the axial direction.
The distance between one end portion of the first electrode and one end portion of the second electrode in each axial direction is shorter than the distance between the other end portion of the first electrode in the axial direction and the position where the uncoated portion of the second electrode starts.
The present utility model also provides a structure of a cylindrical battery including the above electrode assembly.
The cylindrical battery includes a cylindrical battery can having one side surface in the axial direction thereof opened. The electrode assembly is housed in the battery can such that the second electrode uncoated portion faces the bottom surface of the battery can, and the second electrode uncoated portion is electrically connected to the bottom surface of the battery can. The first electrode tab is electrically connected to a battery can lid (cover) covering an upper portion of the battery can.
The battery can side wall includes a curled portion formed by recessing a side wall of the battery can between one end of the electrode assembly in the axial direction and the battery can lid inward in the radial direction.
The first electrode tab portion includes an insulating layer for insulating the first electrode tab from the battery can and the second electrode.
The insulating layer covers one side surface of the electrode assembly in the axial direction, and the first electrode penetrates the insulating layer and is connected to the battery can cover.
The insulating layer is disposed at a position of the first electrode tab adjacent to the second electrode.
The above-mentioned means for solving the problems is also achieved by a battery pack including the cylindrical battery cell and an automobile including the battery pack. Such a battery pack and an automobile are known to those skilled in the art, and therefore, description thereof is omitted in this specification.
Effects of the utility model
The second electrode which is limited in terms of reducing resistance when only improving the tab structure in the two electrodes is applicable to the electrode assembly without the tab structure, so that the structure of the electrode assembly in the gel roll form for reducing the resistance is provided.
In a further aspect of the present utility model, the improved tab structure is applied to the first electrode in which the resistance can be sufficiently reduced by the improvement of the tab structure, so that it is possible to prevent the reduction of the space flexibility and the complication of the manufacturing process due to the increase in the thickness of the first electrode uncoated portion and the collector plate welded thereto in the case where the electrode tab structure is applied and the need to insulate the first electrode uncoated portion and the collector plate from the battery can and the second electrode.
In the present utility model, one or more tabs to which the resistance is applied for reduction are connected to an uncoated portion of the tab at an end portion apart from the active material coated region in the axial direction, and therefore even if the number of tabs increases, the tab is not sandwiched in the region of the coated portion coated with the active material, whereby it is possible to prevent a phenomenon of deterioration due to the heterogeneous thickness of the tab.
The present utility model provides a device for manufacturing a battery, which is capable of easily performing an assembling process of stacking and welding tabs and connecting the tabs to a cap, by arranging the tabs at positions corresponding to each other in the circumferential direction when the tabs are connected to uncoated portions of the ends of the active material application region in the axial direction, the tabs being applied for reducing the resistance.
Even in the case where two or more tabs to which the present utility model is applied for reducing the resistance are connected to an uncoated portion in which the tabs are located in a region corresponding to the active material coated region in the axial direction, they are arranged at positions that do not overlap with each other in the circumferential direction, and thus the phenomenon of degradation due to the heterogeneous thickness of the tabs can be minimized.
In addition, the present utility model can provide a structure of an electrode assembly capable of improving safety by blocking short circuits between a first electrode and a second electrode at both ends in an axial direction even without an excessive insulating process required in the case where an electrodeless ear structure is applied to the first electrode.
The present utility model provides an improved cylindrical battery cell including the above improved electrode assembly, a battery pack including the above battery cell, and an automobile including the above battery pack.
The present utility model may have other various effects, and the respective embodiments will be described or effects that can be easily derived by those skilled in the art, and the corresponding description will be omitted.
Drawings
Fig. 1 shows an electrode laminate in a state before the electrode assembly is formed by winding the electrode laminate in a gel roll form.
Fig. 2a is an expanded view showing a state before winding the first electrode of the tab structure.
Fig. 2b is an expanded view showing a state before the second electrode of the tab structure is wound.
Fig. 3 is a sectional view of a cylindrical battery including an electrode assembly of a tab structure.
Fig. 4 is a sectional view of a cylindrical battery including an electrode assembly of an electrodeless ear structure.
Fig. 5a is an expanded view showing a state before the first electrode of one embodiment of the present utility model in which a continuous uncoated portion is formed at the other axial end of the second electrode is wound.
Fig. 5b is an expanded view showing a state before the second electrode is wound up in an embodiment of the present utility model in which a continuous uncoated portion is formed at the other axial end of the second electrode.
Fig. 6a is an expanded view showing a state before the first electrode of one embodiment of the present utility model having an uncoated portion in a form of intermittently cutting at the other end portion in the axial direction of the second electrode is wound.
Fig. 6b is an expanded view showing a state before the second electrode is wound up in an embodiment of the present utility model in which the other end portion of the second electrode in the axial direction is provided with an uncoated portion in a form of intermittently cutting.
Fig. 7 is a cross-sectional view of an electrode assembly according to an embodiment of the present utility model in which a first electrode is connected to a second electrode, and an uncoated portion protruding and bent to the other side in the axial direction is provided.
Fig. 8 is an electrode assembly of an embodiment of the present utility model in which the second electrode uncoated portion bent in fig. 7 is connected to a collector plate.
Fig. 9 is an enlarged sectional view showing an electrode assembly of an embodiment of the present utility model in which the length in the axial direction of the first electrode is shorter than the length in the axial direction of the second electrode.
Fig. 10 is an enlarged sectional view showing an electrode assembly of an embodiment of the present utility model in which a distance between one side end portions in an axial direction of an active material-coated region in the first and second electrodes of fig. 9 is shorter than a distance between the other side end portions in the axial direction.
Fig. 11 is a sectional view of a cylindrical battery of an embodiment of the present utility model in which one side surface in the axial direction of an electrode assembly is covered with an insulating layer.
Fig. 12 is a cross-sectional view of a cylindrical battery of one embodiment of the present utility model with an insulating layer covering only a portion of the first electrode tab.
Fig. 13 is a view showing a structure in which 2 first electrode tabs protrude in the axial direction at positions different from each other in the radial direction and are welded to first electrode terminals, in a state in which second electrode uncoated portions of an electrode assembly are bent to overlap, are welded directly to the bottom surface of a battery can.
Fig. 14 is a view showing another embodiment in which the distances in the radial direction, in which a plurality of electrode tabs of an electrode assembly are spaced from the center of the electrode assembly, are also different from each other.
Fig. 15 to 17 are developed views of another embodiment of the first electrode and the second electrode.
Fig. 18 is a perspective view of an electrode assembly in a jelly-roll form wound up including the first electrode and the second electrode of fig. 15 to 17.
Fig. 19 is a side cross-sectional view of fig. 18.
Fig. 20 is another embodiment of a second electrode.
Fig. 21 is an enlarged cross-sectional view of a stacked structure using the second electrode of fig. 20.
Fig. 22 is a perspective view illustrating a battery pack including cylindrical battery cells according to the present utility model.
Fig. 23 is a perspective view illustrating an automobile including the battery pack of fig. 22.
(symbol description)
1: electrode assembly
2: first electrode
21: first electrode anode uncoated portion
22: first electrode anode active material
23: first electrode anode tab
3: separation membrane
4: second electrode cathode
41: second electrode cathode uncoated portion
42: second electrode cathode active material
43: cathode tab of second electrode
44: insulating coating
5: current collecting plate
51: first electrode anode collector plate
52: second electrode cathode collector plate
6: battery can
61: side wall
62: bottom surface
63: cover for a container
631: first electrode terminal
633: exhaust port
64: hemming portion
65: insulating layer
C: battery cell
P: battery pack
V: automobile
Detailed Description
The above objects, features and advantages will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily implement the technical idea of the present utility model. In describing the present utility model, a detailed description is omitted when it is determined that the detailed description of the known technology related to the present utility model makes the gist of the present utility model unclear. Hereinafter, preferred embodiments of the present utility model will be described in detail with reference to the accompanying drawings. In the drawings, the same reference numerals refer to the same or similar constituent elements.
Although first, second, etc. are used to describe various constituent elements, these terms do not limit these constituent elements. These terms are only used to distinguish one constituent element from another, and the first constituent element may be the second constituent element unless otherwise stated.
In the entire specification, unless specifically stated to the contrary, each constituent element may be in the singular or the plural.
In the following, when it is described that an arbitrary structure is arranged on the "upper part (or lower part)" or the "upper part (or lower part)" of the constituent element, it means not only a case where the arbitrary structure is arranged in contact with the upper surface or lower surface of the constituent element, but also another structure is interposed between the constituent element and the arbitrary structure arranged on the upper part (or lower part) of the constituent element.
In the case where it is described that a certain constituent element is "connected", "joined" or "in contact with" another constituent element, the constituent elements may be directly connected or in contact with each other, or may be "connected", "joined" or "in contact with each other" through "another constituent element or by" sandwiching "another constituent element between the constituent elements.
The singular forms "a", "an" and "the" as used in this specification include plural referents unless the context clearly dictates otherwise. In the present application, terms such as "constituent" and "comprising" are not to be construed as including all the various constituent elements or steps described in the specification, and a part of constituent elements or a part of steps may not be included or may include additional constituent elements or steps.
In the entire specification, A, B, a and B are shown when "a and/or B" are not shown in particular contrary, and C and D are shown when "C to D" are not shown in particular contrary.
For convenience of explanation, a direction along a longitudinal direction of a winding shaft of an electrode assembly wound in a jelly-roll form will be referred to as an axial direction (Y) in this specification. The direction surrounding the winding shaft is referred to as the circumferential direction or the circumferential direction (X). The direction approaching or separating from the winding shaft is referred to as a radial direction or radial direction (Z). Among them, the direction approaching the winding shaft is specifically referred to as the centripetal direction, and the direction separating from the winding shaft is referred to as the centrifugal direction.
The present utility model provides a structure of a jelly-roll electrode assembly having a structure of reducing resistance, improving space flexibility, and preventing a short circuit, and a structure of a cylindrical battery cell including the same.
Hereinafter, preferred embodiments of the present utility model will be described with reference to the accompanying drawings.
First, a structure of a cylindrical battery having a tab structure and an electrodeless tab structure and a method of manufacturing the same will be described. In general, a cylindrical battery is manufactured by incorporating an electrode assembly wound in a jelly-roll form inside a battery can.
Fig. 1 shows an electrode laminate in a state before the electrode assembly is formed by winding the electrode laminate in a gel roll form. Referring to the figure, the electrode assembly in the jelly-roll form is formed by winding an electrode laminate in which rolls of a first electrode 2, a separation membrane 3, a second electrode 4, and a separation membrane 3 are laminated in this order. Thus, the jelly-roll-type electrode assembly has a shape of a circular tube in which a hollow portion is formed in the winding shaft portion. That is, the longitudinal direction (X) of the electrode laminate corresponds to the circumferential direction (circumferential direction) which is the winding direction of the cylindrical electrode assembly, the width direction (Y) of the electrode laminate corresponds to the axial direction of the electrode assembly, and the normal direction (Z) of the electrode laminate corresponds to the radial direction (centripetal direction or centrifugal direction) of the electrode assembly.
The separation membranes are made of the same material and have the same shape regardless of the lamination position. The separation film is made of a material and a structure that insulates between the two electrodes and transmits an electrolyte to be described later, so as to prevent the first electrode 2 and the second electrode 4 from being electrically shorted in the electrode laminate.
The separation membrane comprises a porous polymer substrate; and a porous coating layer which is positioned on both sides of the porous polymer substrate and comprises inorganic particles and a binder polymer.
The porous polymer substrate is a polyolefin porous substrate.
According to an embodiment of the present utility model, as the porous polymer substrate, polyethylene or polypropylene series may be used. In the porous coating layer, a coating material of Al oxide or Si oxide series can be used as the inorganic particles.
The first electrode 2 is an anode, and the second electrode 4 is a cathode. However, the opposite may be the case, and therefore are referred to as a first electrode and a second electrode in this specification, respectively.
The first electrode 2 is wound so as to be positioned further inside than the second electrode 4. As a result, the first electrode 2 has a shorter radius from the winding axis than the second electrode 4, and thus has a shorter length in the circumferential direction along the winding direction. In this case, the first electrode 2 before winding has a shorter length in the longitudinal direction than the second electrode 4 before winding.
Fig. 2a is an expanded view showing a state before the first electrode of the tab structure is wound, and fig. 2b is an expanded view showing a state before the second electrode of the tab structure is wound, and referring to these views, the active materials 22, 42 are coated on one or both surfaces of each of the first electrode 2 and the second electrode 4. The active materials 22 and 42 are applied to the surfaces of the first electrode 2 and the second electrode 4, and store or release ions to participate in an electrode reaction.
In the present utility model, the anode active material applied to the anode plate and the cathode active material applied to the cathode plate may be arbitrarily used as long as they are active materials known in the art.
The first electrode 2 and the second electrode 4 each include a first electrode uncoated portion 21 and a second electrode uncoated portion 41 to which the active materials 22 and 42 are not applied. In order to electrically connect the first electrode 2 and the second electrode 4 to the outside, the first electrode uncoated portion 21 and the second electrode uncoated portion 41 are provided with a first electrode tab 23 and a second electrode tab 43 electrically connected to the first electrode uncoated portion 21 and the second electrode uncoated portion 41, respectively.
The first electrode tab 23 and the second electrode tab 43 may be formed in one or a plurality thereof.
When the second electrode uncoated portion 41 and the second electrode tab 43 can be provided only at both ends of the second electrode 4 in the manufacturing process, the current path of the second electrode 4 becomes longer and the resistance increases. Further, this is particularly the case where the second electrode 4 has a longer length than the first electrode 2.
Fig. 3 is a sectional view of a cylindrical battery including an electrode assembly of a tab structure. Referring to the figure, an electrode assembly 1 obtained by winding an electrode laminate in a gel roll form is housed in a battery can 6 having one side surface thereof open in the axial direction.
The first electrode tab 23 connected to the first electrode uncoated portion 21 of the electrode assembly 1 is connected to the first electrode terminal 631 provided to the battery can 63, thereby electrically connecting the first electrode 2 to the battery can 63 and the outside. One side surface of the electrode assembly 1 in the axial direction, from which the first electrode tab 23 protrudes, is covered with an insulating layer 65.
The second electrode tab 43 connected to the second electrode uncoated portion 41 of the electrode assembly 1 is connected to the bottom surface 62 of the battery can, thereby electrically connecting the second electrode to the battery can 6 and the outside.
The battery can lid 63 is connected to the first electrode 2, and the battery can 6 is connected to the second electrode 4, and therefore an insulating layer 65 is provided between the battery can lid 63 and the battery can 6 to prevent short-circuiting.
The battery can side wall 61 includes a curled portion 64 recessed radially inward in the electrode assembly 1. By providing such a curled portion 64, the electrode assembly 1 is stably housed in the battery can 6 without any play in the up-down direction.
In the tab structure described above, since the current paths of the first electrode 2 and the second electrode 4 are only the first electrode tab 23 and the second electrode tab 43, the resistance of the portion is very high, and thus heat generation may occur, and performance and durability are poor. Because resistance has a property of being proportional to the length of a current path and inversely proportional to the area, if the current path is narrow, it is disadvantageous to reduce the resistance.
Fig. 4 is a sectional view of a cylindrical battery including an electrode assembly of an electrodeless ear structure. Referring to the figure, an electrode assembly 1 in which an electrode laminate is wound in a gel roll form is housed in a battery can 6 having one side surface open in the axial direction.
A first electrode uncoated portion 21 and a second electrode uncoated portion 41 are formed to protrude from both sides of the electrode assembly 1 in the axial direction, and the first electrode uncoated portion 21 and the second electrode uncoated portion 41 are connected to the current collector plate 5, respectively. At this time, the first electrode uncoated portion 21 and the second electrode uncoated portion 41 are bent in the radial direction, and the joining performance with the first electrode collector plate 51 and the second electrode collector plate 52 is improved.
The first electrode collector plate 51 connected to the first electrode uncoated portion 21 is connected to the first electrode tab 23, and the first electrode tab 23 is connected to the battery can 63 through the first electrode terminal 631, so that the first electrode is electrically connected to the outside.
The second electrode collector plate 52 connected to the second electrode uncoated portion 41 is connected to the battery can bottom surface 62, and thereby electrically connects the second electrode to the battery can 6 and the outside.
The battery can lid 63 is connected to the first electrode 2, and the battery can 6 is connected to the second electrode 4, so that an insulating layer 65 is provided between the battery can lid 63 and the battery can 6 to prevent short-circuiting. In order to prevent short circuit between the first electrode collector plate 51 and the inner wall of the battery can 6, the upper surface and the side surfaces of the first electrode collector plate 51 are covered with an insulating layer 65.
The battery can side wall 61 includes a curled portion 64 recessed radially inward in the electrode assembly 1. By providing such a curled portion 64, the electrode assembly 1 can be stably housed in the battery can 6 without play in the up-down direction.
In the case of the second electrode, the electrode-less tab structure described above is advantageous in that a wider current path is formed on the second electrode 4 side to reduce the resistance by allowing a current to flow through the second electrode uncoated portion 41, the second electrode collector plate 52, and the battery can bottom surface 62. However, since the current flows through the first electrode tab 23 on the first electrode 2 side, it does not contribute to the reduction of the resistance, but the upper and lower lengths of the battery can 6 need to be longer because the first electrode uncoated portion 21, the first electrode collector plate 51, and the insulating layer 65 are added. This results in a shortened length of the electrode assembly 1 in the cylindrical battery cells of the same specification, resulting in a reduced capacity. In addition, when the first electrode uncoated portion 21 and the second electrode uncoated portion 41 are bent in the radial direction in order to improve the joining performance with the collector plate 5, there is a possibility that short circuits may occur between the ends of the second electrode 4 and the first electrode 2 in the axial direction, respectively, and therefore safety is still weak.
On the other hand, a thermal runaway prevention mechanism (CID; current Interrupt Device) and/or an exhaust structure may be applied to the cover 63. However, as described above, the structure in which the first electrode uncoated portion 21 is bent in the radial direction and the current collector plate 5 is welded thereto prevents the internal pressure of the battery can 6 from acting completely on CID, and the exhaust structure and the like are blocked, which affects the battery performance.
In view of this, the present utility model provides a structure of an electrode assembly that achieves a resistance reduction effect and an improvement in space flexibility of an electrodeless ear structure on a second electrode side, and that can sufficiently reduce the resistance of a first electrode side to achieve the space flexibility of the electrodeless ear structure and the improvement in safety against short circuits without employing the electrodeless ear structure.
Fig. 5a to 6b are respectively an expanded view of a state before the first electrode is wound and an expanded view of a state before the second electrode is wound in each embodiment of the present utility model in which a continuous and intermittently cut uncoated portion is provided at the other end portion of the second electrode in the axial direction.
Referring to the above figures, active materials 22 and 42 are coated on both surfaces of the first electrode 2 and the second electrode 4. A first electrode uncoated portion 21 is provided in a part of a longitudinal direction (X) of the first electrode 2 (a region in which an active material is coated in an axial direction (Y)) and a first electrode tab 23 connected to the first electrode uncoated portion 21 protrudes toward one side in a width direction (axial direction after winding) of the first electrode 2. The second electrode 4 has a second electrode uncoated portion 41 at the other end in the width direction thereof and is exposed.
The first electrode uncoated portion 21 and the first electrode tab 23 may be formed in one or a plurality thereof. In the case where the plurality of first electrode tabs 23 are provided, the current path of the first electrode 2 is widened, and a resistance reduction effect can be obtained. As will be described later, the plurality of first electrode tabs 23 are stacked on each other at least in a part of the area after winding to be electrically connected to each other to constitute one tab. Such a structure further facilitates the connection of the first electrode tab 23 and the cover 63.
The number of first electrode tabs 23 is the minimum number that the resistance value detected on the path connected to the first electrode 2 drops below a predetermined resistance value. If the resistance value detected when using 2 first electrode tabs 23 is equal to or less than a predetermined resistance value, it is sufficient to use 2 first electrode tabs 23, and it is not necessary to use 3 or more.
In order to minimize the current path of the first electrode 2, the first electrode uncoated portion 21 and the first electrode tab 23 are provided at appropriate positions. When one of the first electrode uncoated portion 21 and the first electrode tab 23 is provided, the first electrode uncoated portion 21 and the first electrode tab 23 are located at positions avoiding two regions at both ends in the longitudinal direction when the first electrode 2 is divided in the width direction so as to be 3-equally divided in the longitudinal direction (winding direction). When the first electrode uncoated portion 21 and the first electrode tab 23 are provided at two positions, the first electrode uncoated portion 21 and the first electrode tab 23 are provided in 2 regions of two regions which are respectively located so as to avoid both ends in the longitudinal direction when the first electrode 2 is divided in the width direction (winding direction) so as to be equally divided by 4 in the longitudinal direction. In the case where the first electrode uncoated portion 21 and the first electrode tab 23 are provided at 3 or more, the arrangement is also suitably performed by a similar method.
The number of first electrode tabs 23 is minimized by: even if the position of the first electrode tab 23 is properly selected, if the resistance value detected by the selection of the position is higher than a predetermined resistance value, the number of one first electrode tab 23 is added to properly select the position of the first electrode tab 23.
The second electrode uncoated portion 41 is formed continuously in the longitudinal direction thereof as shown in fig. 5a and 5b, and is intermittently cut in the longitudinal direction thereof as shown in fig. 6a and 6b, at the other end portion in the width direction of the second electrode 4. The cutting is performed to bend the second electrode uncoated portion 41 described later.
The first electrode 2 and the second electrode 4 are laminated and wound with the separation film 3 interposed therebetween as described above to form an electrode assembly in the form of a jelly-roll.
Fig. 7 is a cross-sectional view of an electrode assembly according to an embodiment of the present utility model in which a first electrode is connected to a first electrode and a second electrode is provided with an uncoated portion protruding and bent to the other side in the axial direction, and fig. 8 is an electrode assembly according to an embodiment of the present utility model in which the uncoated portion of the second electrode bent in fig. 7 is connected to a collector plate.
Referring to fig. 7, the second electrode uncoated portion 41 protrudes toward the other side of the electrode assembly 1 in the axial direction than the first electrode 2 and the separation membrane 3. The second electrode uncoated portion 41 is bent in the radial direction. The radial direction is a concept including a centrifugal direction and a centripetal direction. According to the embodiment, it is more preferable that the second electrode uncoated portion 41 is bent in the centripetal direction. Thus, the second electrode uncoated portion 41 provides a flat surface on the other side in the axial direction, and can improve the joining performance when joined to the collector plate 5 or the battery can bottom surface 62 described later. In addition, the current path can be further widened to reduce the resistance.
Referring to fig. 8, the collector plate 5 is connected to the surface of the bent second electrode uncoated portion 41. The electrode assembly 1 is housed in a battery can 6 described later, and the second electrode uncoated portion 41 is electrically connected to the bottom surface 62 of the battery can 6, so that the current collector plate 5 is sandwiched therebetween, thereby improving the safety of assembly and joining.
The first electrode tab 23 may protrude to one side in the axial direction than the second electrode 4 and the separation film 3 in a wound state. In the case of providing a plurality of the first electrode tabs 23, they are stacked on each other and electrically connected to form one tab. Thereby, the current path becomes wider and the resistance decreases.
Fig. 9 is an enlarged sectional view showing an electrode assembly of an embodiment of the present utility model in which the length in the axial direction of the first electrode is shorter than the length in the axial direction of the second electrode. Referring to the drawing, in particular, the second electrode 4 and the first electrode may be short-circuited to each other during bending of the second electrode uncoated portion 41. In the case of a general jelly-roll electrode assembly, such a short circuit is prevented by projecting the separation film 3 in two directions in the axial direction than the first electrode 2 and the second electrode 4, whereas in the electrodeless ear structure of the embodiment of the present utility model, the second electrode uncoated portion 41 projects to the other side in the axial direction than the separation film 3, and thus it is difficult to prevent such a short circuit.
In order to solve the short-circuit problem as described above, the first electrode 2 is shorter in length in the axial direction than the second electrode 4. Thereby, the other end portion of the first electrode 2 in the axial direction is located deeper into the separation film 3, and thereby the separation film 3 insulates the second electrode uncoated portion 41 from the first electrode 2, and the possibility of occurrence of short-circuiting is reduced.
Fig. 10 is an enlarged sectional view showing an electrode assembly of an embodiment of the present utility model in which a distance between one side end portions in an axial direction of an active material-coated region in the first electrode and the second electrode in fig. 9 is shorter than a distance between the other side end portions in the axial direction. Referring to the figure, a distance between one end portion of the first electrode 2 in the axial direction and one end portion of the second electrode 4 in the axial direction is shorter than a distance between the other end portion of the first electrode 2 in the axial direction and a position where the second electrode uncoated portion 41 on the second electrode 4 starts to be formed.
This is because the first electrode 2 side has a tab structure, and unlike the electrodeless tab structure, there is little risk of occurrence of short circuit. Since the first electrode 2 is not bent and the first electrode tab 23 is insulated without applying pressure, the risk of short-circuiting is significantly reduced compared to the case where the second electrode uncoated portion 41 is bent. Therefore, the distance between the ends of the first electrode 2 and the second electrode 4 in the axial direction is reduced at the portion where the first electrode tab 23 protrudes, thereby improving the space flexibility and the capacity.
In order to improve the space flexibility, the first electrode 2 is disposed so that one end in the axial direction thereof is disposed in parallel with or inside the one end in the axial direction of the second electrode 4, that is, so that the height thereof is equal to or lower than the height of the one end in the axial direction of the second electrode 4. This is because: unlike the case where the other side end portion in the axial direction of the second electrode uncoated portion 41 is located on the other side in the axial direction of the first electrode 2, the other side end portion in the axial direction of the first electrode 2 is located on the inner side to avoid a short circuit with the second electrode 4 than the other side end portion in the axial direction of the second electrode 4, and the one side end portion in the axial direction of the second electrode 4 is set to be lower or set to be further inside than the one side end portion in the axial direction of the first electrode 2, so that the end portion of the first electrode 2 is not projected toward the one side in the axial direction, and thus the space flexibility and the capacity can be improved.
In an electrode assembly according to an embodiment of the present utility model, an electrode laminate is produced by winding a first electrode 2, a separator 3, a second electrode 4, and a separator 3 in this order around a winding axis in a winding direction (longitudinal direction), wherein the first electrode 2 is an anode, the second electrode 4 is a cathode, the first electrode 2 is divided in the longitudinal direction 4 so as to be divided in the longitudinal direction, first electrode tabs 23 are electrically connected to 2 regions of regions avoiding both ends in the longitudinal direction, respectively, on the first electrode uncoated portion 21, the first electrode tabs 23 protrude on one side in the width direction (axial direction), the second electrode 4 is longer than the first electrode 2, the second electrode 4 is provided with a second electrode uncoated portion 41 in a form of being intermittently cut in the longitudinal direction (winding direction) along the other end in the width direction, the second electrode uncoated portion 41 is disposed on the other side in the width direction than the first electrode 4, and the length of the second electrode 4 is shorter than the length of the second electrode 4 on the other side in the width direction than the first electrode 4, the second electrode 4 is disposed on the other side opposite side of the first electrode tab being shorter than the length of the second electrode 4 in the width direction, the first electrode tab 23 protrudes to one side in the axial direction of the electrode assembly 1 to be stacked on each other to form one tab, the second electrode uncoated portion 41 is bent in the centripetal direction to form a flat surface, and the current collector plate 5 is welded to the flat surface formed by bending the second electrode uncoated portion 41.
The present utility model also provides a structure of a cylindrical battery cell including the above-described improved electrode assembly.
Fig. 11 and 12 are a sectional view of a cylindrical battery according to an embodiment of the present utility model in which one side surface in the axial direction of an electrode assembly is covered with an insulating layer and a sectional view of a cylindrical battery according to an embodiment of the present utility model in which only a portion of a first electrode tab is covered with an insulating layer, respectively.
Referring to fig. 11, a cylindrical battery according to an embodiment of the present utility model includes a battery can 6 having one side surface thereof opened in an axial direction, and the electrode assembly 1 is housed in the battery can 6 such that a second electrode uncoated portion 41 thereof faces a bottom surface 62 of the battery can 6. The second electrode uncoated portion 41 is electrically connected to the battery can bottom surface 62, and the collector plate 5 is sandwiched between the second electrode uncoated portion 41 and the battery can bottom surface 62. At this time, the second electrode uncoated portion 41 is directly connected to the battery can bottom 62 without the current collecting plate 5, thereby improving space flexibility and capacity.
A bead 64 is provided on one side of the battery can 6 in the axial direction in which the electrode assembly 1 is housed, the sidewall 61 of the battery can 6 is recessed inward for fixing the electrode assembly 1, a battery can lid is provided on the bead 64, an insulating layer 65 is interposed between the battery can 6 and the battery can lid, and the battery can is fixed by pressure bonding and covers one opening in the axial direction of the battery can 6.
The first electrode tab 23 protrudes toward one side of the electrode assembly 1 in the axial direction and is connected to the battery can cover 63 through a first electrode terminal 631. The first electrode terminal 631 may be provided independently and electrically connected to the cover 63, may be provided as a part of the cover 63, and may be the first electrode terminal 631 itself.
A thermal runaway prevention mechanism (CID; current Interrupt Device) and/or an exhaust mechanism are applied to the cover 63. The cap 63 is electrically connected to the first electrode terminal 631 through the thermal runaway prevention mechanism (CID; current Interrupt Device) and/or the exhaust structure.
At this time, one side surface of the electrode assembly 1 in the axial direction protrudes the first electrode tab and is covered with the insulating layer 65.
Referring to fig. 12, the insulating layer 65 is preferably formed to cover a portion between the battery can cover 63 and the battery can 6 and between the first electrode tab 23 and the second electrode 4, which may interfere with each other, and preferably to cover a boundary portion of the first electrode tab 23 where the jelly-roll portion of the electrode assembly 1 protrudes. As a result, as shown in fig. 11, the electrode assembly 1 has a better space flexibility and an increased capacity than the electrode assembly of the type in which one side surface is entirely covered.
In the cylindrical battery cell according to the embodiment of the present utility model, the electrode assembly 1 according to the embodiment of the present utility model is housed in a battery can having an upper portion opened so that the second electrode uncoated portion 41 is directed downward, the second electrode uncoated portion 41 is electrically connected to the bottom surface 62 of the battery can 6, the first electrode tab is electrically connected to the battery can cover 63 by a first electrode terminal 631 provided on the battery can cover 63 covering the upper portion of the battery can 6, and an insulating layer 65 covers a portion where short circuit between the first electrode tab 23 and the second electrode 4 is likely to occur and between the battery can 6 and the cover 63.
Fig. 13 shows a structure in which the second electrode uncoated portion 41 of the electrode assembly 1 is directly welded to the bottom surface 62,2 of the battery can 6 in a state where it is folded and overlapped, and the first electrode tabs 23 protrude in the axial direction at positions different from each other in the radial direction and are welded to the first electrode terminals 631.
The bottom surface 62 of the battery can 6 has a concave structure slightly recessed from the lower end of the side wall 61 of the battery can 6. When welding such a recessed portion to the second electrode uncoated portion 41, the bottom surface 62 is irradiated with laser light to perform welding, and the recessed structure of the bottom surface 62 prevents such a welded portion from coming into contact with the ground to cause damage.
The first electrode terminal 631 includes a vent 633 configured to reduce rigidity by cutting. Referring to fig. 13, the energy density is improved by surely providing the electrode assembly 1 having the active material applied thereto before the crimping portion 64, as compared with fig. 4.
The insulating layer 65 crimped together with the cover 63 extends in the axial direction to cover the inner periphery around the curled portion. At the same time, the inner peripheral surface of the insulating layer 65 gathers the electrode tab 23 radially inward, thereby ensuring that the electrode tab 23 does not come into contact with the side wall 61 of the battery can 6.
The cylindrical battery can 6 is filled with an electrolyte for performing a battery reaction.
Fig. 14 shows another embodiment of the electrode assembly 1. As shown in fig. 5a to 6b, when the electrode tab 23 is connected to the region coated with the active material in the axial direction, the thickness of the gel roll in the radial direction of the region in the circumferential direction where the electrode tab 23 is disposed is thicker than that in other regions due to the thicker electrode tab 23. According to the embodiment, in order to minimize such thickness deviation, a structure in which the plurality of electrode tabs 23 are arranged at positions different from each other in the circumferential direction is exemplified. When the plurality of electrode tabs 23 are arranged at positions different from each other in the circumferential direction, these are preferably arranged at substantially equal intervals in the circumferential direction. As shown in the figure, in the case of providing 3 electrode tabs 23, the included angle between them is about 120 degrees.
Of course, as shown in the drawing, the distances in the radial direction, at which these multiple electrode tabs 23 are spaced from the center of the electrode assembly 1, are also different from each other. The above-described selection of the positions of the electrode tabs 23 has been described with reference to fig. 5a to 6 b. The intervals in the radial direction of the plurality of electrode tabs 23 become smaller gradually as approaching the centrifugation from centripetal direction. When the radii of the electrode tabs disposed closest to the centrifugal side from the most centripetal side are r1, r2, r3, and r4, the relationship of (r 2-r 1) > (r 3-r 2) > (r 4-r 3) may be provided.
The plurality of electrode tabs 23 are each elastically deformed in the centripetal direction so that a part of the areas overlap each other. These may be welded to the cover 63 at a time or sequentially.
Fig. 15 to 19 show another embodiment of the electrode assembly 1. Referring to fig. 15, the first electrode 2 includes a first electrode uncoated portion 21 to which an active material 22 is not applied on one side in the axial direction. A plurality of first electrode tabs 23 are fixed to the first electrode uncoated portion 21 and electrically connected thereto.
The second electrode 4 includes a second electrode uncoated portion 41 to which the active material 42 is not applied on the other side in the axial direction. The second electrode uncoated portion 41 gradually or stepwise increases in length in the axial direction as approaching the centrifuge from the center. The second electrode uncoated portion 41 is formed in a cut tab shape, and the tip end portion of the cut tab is bent and lies on the radial direction.
The cutting tabs are not provided at a certain section of the most centripetal side and the most centrifugal side. The part without the cutting tab is not bent. The centrifugal side 1 ring is removed during manufacture to prevent the cut tabs from being inadvertently deformed.
The first electrode tab 23 does not extend in the width direction (Y) in the region where the first electrode active material 22 is not applied. In this way, even when the first electrode 2, the second electrode 4, and the separator 3 are wound to form the electrode assembly 1, the first electrode tab 23 is not sandwiched between the application regions of the active materials 22 and 42 that are tightly adhered in the radial direction. In this way, even if the radius of the jelly-roll repeatedly expands and contracts during charge and discharge, there is no area where excessive pressure is received, and deterioration due to this can be prevented.
Fig. 15 illustrates a configuration in which the first electrode uncoated portion 21 extends widely in the longitudinal direction. In such a structure, if the first electrode uncoated portion 21 is too long, the risk of short-circuiting becomes high, and if the first electrode uncoated portion 21 is too short, it is disadvantageous to secure a bonding area with the first electrode tab 23.
To solve this problem, fig. 16 discloses a structure in which the height of the first electrode uncoated portion 21 is higher only in the section where the first electrode tab 23 is bonded, and the first electrode uncoated portion 21 is kept short in the remaining region. In this way, if the height of the first electrode uncoated portion 21 is reduced, the first electrode uncoated portion 21 is prevented from protruding further outward than the separation film 3.
As shown in fig. 17, if the first electrode uncoated portions 21 other than the region where the first electrode tab 23 is joined are removed entirely, the area of the first electrode 2 contributing to the electrical capacity can be maximized.
In this way, according to the structure in which the plurality of first electrode tabs 23 are connected to the first electrode uncoated portion 21 protruding to one side in the axial direction, as shown in fig. 18 and 19, the first electrode tabs 23 are arranged at positions that coincide with each other in the circumferential direction. Since the first electrode tab 23 is disposed at a position apart from the active material coating layer in the jelly-roll, it is not necessary to dispose them so as to be dispersed in the circumferential direction.
Instead, if they are arranged at substantially the same positions in the circumferential direction, the first electrode tabs 23 in the shape of a plate are arranged substantially parallel to each other as shown in the figure, and therefore, they can be bent side by side. Therefore, compared with the case where the plurality of first electrode tabs 23 are arranged so as to be dispersed in the circumferential direction, the welding with the cover 63 and the processing after the welding of the cover 63 are easier to perform. In particular, they are spaced apart from each other in the radial direction, but are arranged on the same radial line, and therefore have the effect of reducing the internal resistance.
In particular, when the position of the first electrode tab 23 is required to be arranged so that the first electrode uncoated portion 21 protrudes to one side in the axial direction, as shown in fig. 16 and 17, the first electrode uncoated portion 21 is formed to be higher in a predetermined section or is provided only in a predetermined section, the first electrode uncoated portion 21 in the section protrudes to one side in the axial direction, and when the section is set to be wider in response to winding deviation, the first electrode tab 23 is formed after the first electrode uncoated portion 21 protruding in the axial direction after winding the electrode assembly 1, and then the first electrode tab 23 is brought into contact connection, so that the positions in the circumferential direction of the first electrode tab 23 are accurately aligned.
At the same time, since the first electrode tab 23 is gathered in the smallest area while maintaining an appropriate interval in the radial direction, the insulating layer 65 is formed so as to include only this area, and thus, various advantages can be obtained such as ease of providing the insulating layer 65, and firm contact of the first electrode tab 23 with the first electrode uncoated portion 21 through the insulating layer 65.
Even in the case where the plurality of first electrode tabs 23 are applied, the structure of the plurality of first electrode tabs 23 minimizes the area of the cover 63 that needs to be left free for welding with the first electrode tabs 23, and the position thereof can be determined as a portion (the region indicated by the double-dashed line in fig. 18 and 19) extending in the radial direction at one position in the circumferential direction, so that CID or exhaust port can be easily applied to the cover 63 while the plurality of first electrode tabs 23 are connected to the cover 63.
Fig. 20 is a developed view of the second electrode 4 in which the insulating coating 44 is additionally applied to the second electrode uncoated portion 41. Fig. 21 is an enlarged view of the second electrode uncoated portion 41 of fig. 20 coated with the insulating coating layer, which is wound up and then bent.
The insulating coating 44 enhances the rigidity in the vicinity of the tip portion of the second electrode uncoated portion 41. As a result, when the second electrode uncoated portion 41 is forced in the axial direction by the second electrode collector plate 52 or the bottom surface 62 of the battery can 6 in order to weld the second electrode uncoated portion 41, the tip portion of the second electrode uncoated portion 41 may not bend.
If the distal end portion of the second electrode uncoated portion 41 is reinforced by the insulating coating 44, even if the distal end portion of the second electrode uncoated portion 41 is bent, the second electrode uncoated portion 41 and the first electrode 2 do not directly contact each other but contact each other with the insulating coating 44 interposed therebetween, and thus a short circuit phenomenon between the first electrode 2 and the second electrode 4 can be prevented.
The insulating coating 44 provides bending electric resistance in the step of bending the second electrode uncoated portion 41 in the radial direction. Thus, when the second electrode uncoated portion 41 is bent in the radial direction, the region to which the insulating coating 44 is applied is hardly deformed, and deformation mainly occurs in the region to which the insulating coating 44 is not applied.
The insulating coating 44 is provided in a predetermined region from the boundary between the coated portion of the second electrode active material 42 and the uncoated portion 41 of the second electrode toward the end of the uncoated portion 41 of the second electrode. The insulating coating 44 extends further from the inner side of the axial end portion of the separation membrane 3 to the outer side of the separation membrane 3 in the axial direction.
The insulating coating 44 covers the coating portion of the second electrode active material 42 and the boundary portion of the second electrode uncoated portion 41 together with the micro-regions at the end portions of the coating portion of the second electrode active material 42. The portion that is deformed most by bending is a boundary portion between the coated portion of the second electrode active material 42 and the second electrode uncoated portion 41. The insulating coating 44 covers all of the micro-regions at the end of the coating portion of the second electrode active material 42 at such a boundary portion, and thus greatly increases the bending resistance at the boundary portion between the coating portion of the second electrode active material 42 and the second electrode uncoated portion 41.
The insulating coating 44 is coated with a certain thickness or its thickness varies in the axial direction. In fig. 21, the thickness of the insulating coating 44 gradually increases in the end sliding region (region of reduced thickness) of the cathode active material.
The thickness of the insulating coating layer 44 is thinner than that of the cathode active material layer. Thus, as shown in the drawing, the coated portion of the second electrode active material 42 is in close contact with the separation membrane 3 in the radial direction, and the insulating coating 44 may be spaced apart from the separation membrane 3 to some extent or may be in contact with the separation membrane but may not be in close contact with the separation membrane.
In this way, in the bending step of the second electrode uncoated portion 41 and in the step of welding the second electrode uncoated portion 41 to the second electrode collector plate 52, even if the second electrode uncoated portion 41 receives an external force to deform the distal end portion of the second electrode uncoated portion 41, the deformation amount can be suppressed, and the deformation of the distal end portion of the second electrode uncoated portion 41 does not immediately affect the separation film 3. That is, the second electrode uncoated portion 41 includes a section which does not affect the separation membrane 3 and allows deformation in accordance with the interval between the insulating coating 44 and the separation membrane 3.
Meanwhile, when the insulating coating 44 is spaced apart from the separation membrane 3 described above, a phenomenon in which heat generated during welding of the second electrode uncoated portion 41 to the second electrode collector plate 52 or the bottom surface 62 of the battery can 6 is directly transferred to the separation membrane 3 through the insulating coating 44 can be prevented, and the separation membrane 3 can be protected from welding heat. Meanwhile, since the protruding height of the separation membrane 3 in the axial direction can be reduced by the insulating coating 44, the distance from the position where the welding heat occurs to the end of the separation membrane 3 in the axial direction can be further increased, and the effect of protecting the separation membrane 3 in the welding heat can be enhanced.
Since the electrode assembly 1 is wound in a cylindrical shape, the insulating coated region of the second electrode uncoated portion 41 coated with the insulating coating 44 also has a cylindrical curved surface. The cylindrical curved surface itself has bending resistance. According to an embodiment, the insulating coating region has a thicker cylindrical curved surface, and therefore, when the region provided on the upper portion of the cylindrical curved surface is bent in the radial direction, the insulating coating region provides a greater bending resistance. Thereby, bending is guided at the portion of the second electrode uncoated portion 41 where the insulating coating is not performed.
At this time, since the insulating coating region provides higher bending resistance, the thickness of the insulating coating layer 44 is thinner than that of the cathode active material layer, and the surface of the insulating coating layer 44 is spaced apart from the separation membrane 3 in the radial direction, so that the bending resistance can be sufficiently exhibited even if the separation membrane 3 cannot be supported.
The distal end portion of the insulating coating 44 is coated so as to be slightly spaced apart from the bent portion F of the second electrode uncoated portion 41 (G). Thereby, the effect of guiding the second electrode uncoated portion 41 to bend at the bending portion F is achieved. Further, the second electrode uncoated portion 41 deforms from the insulating coating 44 with a slight gap (G) therebetween, and therefore, damage to the insulating coating 44 due to the bending process of the uncoated portion can be prevented.
In this way, the second electrode uncoated portion 41 provided with the insulating coating 44 can be prevented from being bent even when pressed in the axial direction.
Fig. 22 and 23 are perspective views showing a battery pack including a cylindrical battery cell according to the present utility model and a car including the battery pack of fig. 22. Referring to these drawings, the electrode assembly and the cylindrical battery cell C of the present utility model may be applied to a battery pack P including the same and an automobile V including the battery pack P described above. The implementation of such a battery pack P and an automobile V is well known to those skilled in the art, and therefore, a separate description is not given in this specification.
The above-described embodiments are merely illustrative in all respects, the utility model is not limited thereto, and the scope of the utility model is better defined by the following claims rather than the above-described detailed description thereof. It is intended that the scope of the following claims be interpreted as meaning all the modifications and variations that can be derived from the equivalent concept thereof, and are included in the scope of the present utility model.
The present utility model has been described above with reference to the drawings, but the present utility model is not limited to the embodiments and drawings disclosed in the present specification, and various modifications can be made by those skilled in the art within the scope of the technical idea of the present utility model. In the above description of the embodiments of the present utility model, although the operational effects of the structure of the present utility model are not explicitly described, the effects predicted by the structure should be recognized.

Claims (25)

1. An electrode assembly comprising an electrode laminate, which is a gel roll electrode assembly comprising a first electrode, a separator, a second electrode and a separator, which are laminated in this order,
the electrode assembly includes:
a first electrode tab electrically connected to the first electrode; a kind of electronic device with high-pressure air-conditioning system
A second electrode uncoated portion provided on a part of the second electrode and not coated with an active material,
the first electrode tab protrudes to one side in the axial direction than the first electrode,
the uncoated portion of the second electrode is exposed to the other end portion of the second electrode in the axial direction, and functions as a tab.
2. The electrode assembly of claim 1, wherein the electrode assembly comprises,
the number of the first electrode lugs is one or more than two.
3. The electrode assembly of claim 2, wherein the electrode assembly comprises,
the two or more first electrode tabs are stacked and electrically connected to form one tab.
4. The electrode assembly of claim 2, wherein the electrode assembly comprises,
the one first electrode tab is connected to the first electrode at a position avoiding both end portions of the first electrode in the winding direction.
5. The electrode assembly of claim 2, wherein the electrode assembly comprises,
the two or more first electrode tabs are connected to the first electrode at positions avoiding both end portions and a central portion of the first electrode in the winding direction.
6. The electrode assembly of claim 1, wherein the electrode assembly comprises,
the first electrode tab is in contact with a first electrode uncoated portion that is not coated with an active material.
7. The electrode assembly of claim 6, wherein the electrode assembly comprises,
the first electrode uncoated portion is provided in a region corresponding to the region coated with the active material in the axial direction.
8. The electrode assembly of claim 6, wherein the electrode assembly comprises,
the first electrode uncoated portion is formed so as to extend further outward in the axial direction at an end portion in the axial direction of the region coated with the active material.
9. The electrode assembly of claim 8, wherein the electrode assembly comprises,
the first electrode uncoated portion is provided in the overall length direction or a part of the length direction.
10. The electrode assembly of claim 8, wherein the electrode assembly comprises,
the first electrode uncoated portion extends outward in the axial direction to have a predetermined section including a portion where the first electrode tab contacts longer than the remaining section.
11. The electrode assembly according to claim 7 or 8, wherein,
the first electrode tab is formed in plurality,
the plurality of first electrode tabs are arranged at different radial positions from each other in the radial direction.
12. The electrode assembly of claim 7, wherein the electrode assembly comprises,
the first electrode tab is formed in plurality,
the positions of the plurality of first electrode tabs in the circumferential direction do not overlap with each other.
13. The electrode assembly of claim 8, wherein the electrode assembly comprises,
the first electrode tab is formed in plurality,
at least a part of the positions in the circumferential direction of the plurality of first electrode tabs are arranged to overlap each other.
14. The electrode assembly of claim 1, wherein the electrode assembly comprises,
the first electrode has a length in the axial direction shorter than a length in the axial direction of the region coated with the active material in the second electrode and the separation membrane.
15. The electrode assembly of claim 14 wherein the electrode assembly comprises,
the first electrode has a height at one end in the axial direction that is equal to or lower than a height at one end in the axial direction of the second electrode.
16. The electrode assembly of claim 15 wherein the electrode assembly,
The distance in the axial direction between one end of the first electrode in the axial direction and one end of the second electrode in the axial direction is shorter than the distance in the axial direction between the other end of the first electrode in the axial direction and the position where the uncoated portion in the second electrode starts.
17. The electrode assembly of claim 1, wherein the electrode assembly comprises,
the second electrode uncoated portion has a shape cut continuously or intermittently in the winding direction.
18. The electrode assembly of claim 1, wherein the electrode assembly comprises,
the height of the second electrode uncoated portion protruding in the axial direction increases continuously or intermittently.
19. The electrode assembly of claim 1, wherein the electrode assembly comprises,
the second electrode uncoated portion is bent in a radial direction.
20. The electrode assembly of claim 19 wherein the electrode assembly,
a collector plate is bonded to the surface of the bent uncoated portion of the second electrode.
21. A cylindrical battery comprising the electrode assembly according to any one of claims 1 to 20.
22. The cylindrical battery according to claim 21, comprising:
A battery can having one axial side surface opened to house the electrode assembly with the second electrode uncoated portion facing the bottom;
a battery can cover that covers an open upper portion of the battery can in a state in which the electrode assembly is housed in the battery can; a kind of electronic device with high-pressure air-conditioning system
An insulating layer for insulating the first electrode tab from the battery can and the second electrode at the axial end,
the first electrode tab is electrically connected with the battery can cover,
the second electrode uncoated portion is electrically connected to the bottom surface of the battery can.
23. The cylindrical battery as in claim 22, wherein,
the side wall of the battery can is provided with a curled portion protruding inward in the radial direction to vertically fix the electrode assembly,
the insulating layer is disposed between the beading portion and the electrode assembly.
24. The cylindrical battery as in claim 22, wherein,
the insulating layer covers one side surface of the electrode assembly in the axial direction, and the first electrode tab penetrates the insulating layer to protrude toward one side in the axial direction.
25. The cylindrical battery as in claim 22, wherein,
The insulating layer is provided at each boundary portion of the first electrode tab, the second electrode, and the battery can.
CN202223216327.1U 2021-12-01 2022-11-30 Electrode assembly and cylindrical battery Active CN219017867U (en)

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KR20050121914A (en) * 2004-06-23 2005-12-28 삼성에스디아이 주식회사 Secondary battery and electrodes assembly
US8236441B2 (en) * 2007-07-24 2012-08-07 A123 Systems, Inc. Battery cell design and methods of its construction
EP2378595B1 (en) * 2008-12-19 2015-03-25 LG Chem, Ltd. High-power lithium secondary battery
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US11749842B2 (en) * 2018-11-05 2023-09-05 Tesla, Inc. Cell with a tabless electrode
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